Problem Palindrome Partitioning

 1     public List<List<String>> partition(String s) {
 2 List<List<String>> l = new LinkedList<List<String>>();
 3         List<String> ll = new LinkedList<String>();
 4 
 5         if (s.length() == 1) {
 6             ll.add(s);
 7             l.add(ll);
 8             return l;
 9         }
10         for (int i = 0; i < s.length(); i++)  {
11             String str = s.substring(0, i+1);
12             if (! isPalindrome(str)) {
13                 continue;
14             } else {
15                 List<List<String>> others = partition(s.substring(i+1)); 
16                 if (others.size() > 0) {
17                     for (List<String> other : others) {
18                         other.add(0, s.substring(0, i+1));
19                         l.add(other);                    
20                     }
21                 } else {
22                     ll.add(str);
23                     l.add(ll);
24                     return l;
25                 }
26                 
27             }
28         }
29 
30         return l;
31     }
32     public boolean isPalindrome(String s) {
33         return s.equals(new StringBuilder(s).reverse().toString());
34     }